Core-oven.



t'. S.GARRETT.

CORE OVEN.

- APPLIGATION FILED JAN. 15, 1913.

Patented June 9,1914.

3 SHEETS-SHEET 1.

F. S. GARRBTT.

COREOVEN.

APPLICATION FILED JAN.15. 1913.

3 SHEETS-SHEET 2.

Patented June 9,1914.

@V o: l v

P. s. GARRBTT.

com: OVEN. l APPLICATION FILED JAN. 15, 1913.

Patented June 9, 1914;

3 SHEBTSFSHEET 3.

' UNITED sTATEs PATENT oEEIoE.

FRANK S. GARR/ETT, OF HOBOKEN, NEW JERSEY, ASSIGNOR TO ROCKWELL FURNACE` COMPANY, A CORPGRATION NEW YORK.

CORE-OVEN.

Specification of Letters Patent.

Application filed January 15, 1913. Serial No. 742,092.

T all 'whom it may concern:

Be it known that lf, FRANK S. GARRETT, a citizen of the United States, and a' resident of Hoboken, in the county of Hudson and State of New Jersey, have invented certain new and useful improvements in Core- Ovens, of which the following is a specification.

ln the designing of core ovens heretofore the general object has been to heat the oven chamber uniformly, or substantially so, throughout. When the oven chamber is not completely filled with cores, a considerable these faults and this ob the provision of means. or heating variablypositioned predetermined portions of they oven chamber at will. ln this way provision is made whereby when, on account of the shape, size or location of a articular core or cores, more heat 1s needed 1n one 'or more portions of the oven chamber, that requlsite amount of heat will be supplied justr as needed. Or again, if the cores only occupy va certain portion of the oven chamber, the

heat will be supplied to that particular portion of the chamber to the practical exclusion of other portions of the chamber.

A preferred manner of carryingI out the invention is to convey the heating medium from the furnace or other source of heat up 'through conduits 'in the side Walls of thev oven chamber andl to provide the conduits with regulatable discharge outlets which open into different portions of the oven chamber. rlhen by opening or closing these variably-located discharge outlets any predetermined portion of the oven chamber may be heated as desired. rlhe Waste products may be taken out through a suitable exit ue and preferably this exit flue extends along the bottomof the oven chamber and is incommunication with the chamber substantially-the full v,length of the same so as to forml a common outlet for any portions of is to 'remedy -side wall of the oven chamber.

the chamber being heated. The ovens ma be built singly or in a battery, in whic` latter case the ovens would preferably be disposed side by side, each provided with an independently operable heating furnace and all discharging their waste products at the back into a common exhaust passage.

Various other objectsand features of my invention will appear as the speciication proceeds.

In the drawings accompanying the specifcation I have illustrated my invention in a concrete .and preferredV embodiment but l Would have it understood that the invention is capable of manyV changes and modifications without departure from the spirit and scope of the invention.

ln the drawings: Figure 1 is a broken top plan view, partl in section, of a battery of core ovens embo ying the invention, the section being taken substantially on the line 1 1 of Fig. 3. Fig. 2 is a longitudinal sectional view of one ofthe ovens, this view being taken substantially on the line 2--2 of Fig. 1. Fig. 3 is a transverse sectional view taken substantially on the line 3--3 of Fig. l. Fig. 4 is a detail view of one of the removable grating sections and the cover therefor. Fig. 5 is a verticalsectional view illustrating a modification in which a ,smoke Hue is provided in the upper portion of the 6 is a broken plan view of this modification.

Like reference characters lrefer to like parts throughout the several views.

'.The'oven chamber is designated by the reference character 5 and the means for supplying the heat is here shown as a furnace 6. This furnace is, in the illustratioii, provided with a grate 7 and also with a burner opening 8, so that it may operate either as a coal-burning or gas or oil-fired furnace. EX-

tending from the furnace is a supply conduit 9 which in the illustration is branched at 10 into two conduits 11 extending alongside of and substantially beneath the base of the side walls 12 of the oven chamber. The heating medium is then conducted from the supply conduits 11 up through the branch passages 13 which, as shown, preferably pass up through the 'side walls l2 and are provided with discharge outlets 14 opening into the oven chamber. These discharge outlets are, as best shown in Figs. 2 and 3,

.preferably disposed atdiferent levels inthe oven chamber and also'at different points the length ofthe oven chamber. The discharge from these various outlets may .be

v carrying cH' the waste products 1n the oven chamber and the means for this' purpose here takesthe form of an exit Hue 16 located in the bottom of the oven chamber and communicating at its rear end with an exhaust passage `17. The exit Hue 16 preferably extends substantially the full length of the oven chamberx and also it is preferably placed 'in communication with the oven chamber for substantially the full length of the chamben In the illustration the exit Hue' is in communication with the chamber by means of a grating 18. The object of having this vexit Hue in communication with the chamber for its'full length is to thereby provide a common means for carrying oif the waste products from any and all portions of the oven chamber which are being heated.

Figs. 1 and 3 illustrate the circulation of the heating medium. From these views it will be clear that the heating medium Hows from the source of heat up through the conduits in the side walls of the oven chamber and through the variably-located discharge outlets into the oven chamber. The waste products How downwardly into the. centrally located exit Hue in the bottom of the chamber, as indicated in Fig. 3, and thence through this Hueout to the exhaust passage at the back of the chamber. In Fig. 2 the middle discharge outlets are shown closed,

with the upper ones open. The heating medium therefore enters in the top portion of the oven and the heat is therefore greatest at this level. Ifthe lower discharge outlets only were open then the heat would be confined practically to thebottom portion of the.

furnace'. The intermediate portion of the furnace will. be heated by closing ,all but thel intermediate series of discharge outlets. By leaving all the discharge' outlets open, the 'oven chamber will be heated substantially uniformly throughout. One end of the'oven chamber may be heated to the exclusion of other portions of the chamber by closing all `less of4 a sliding movement thereon.

heated uniformly throughout so that all the many different requirements of a core oven may be met.

The ,co'res or other.. articles to be baked yor treated are supported within the oven chamber in any suitable Way. Preferably for ease in transportation they are carried upon cars which move over the tracks 19 ex- `tending into the oven chamber. A suitable entrance or doorway is provided to the oven chamber and preferably the entire front end of the chamber is left open so as to permit the greatest freedom in placing and removing the cores. This'doorwayl is closed by a suitable door 20 which, in the presentinstance, is shown mounted to slide in the vertical guides 21. The means for operating this door is shown in the form of chains 22 which pass over sheaves 23 and are con. nected with counter-weights 24, the said sheaves being mounted on a shaft 25 carrying a wheel 26at one end over which passes a hand-chain 27.

' The waste products from the oven cham- I ber are preferably finally discharged vthrough a suitable stack 28 with which the exhaust passage 17 communicates (Fig. 1) and' for e the purpose of carrying 0H" any fumes or vapors liberated inthe oven chamber, there are -preferably provided suitable exhaust pipes 29 which extend from the top portions of the oven chambers and may discharge directly into the stack, as indicated in the several views. As the side walls of the heating chambe may. be more or less affected by the unequal heating of the variousportions of the chamber, I make provision whereby any expansion or contraction of the side walls ofthe chamber, occasioned by such unequal heating, will have no injurious effect upon the chamber as a whole. To this end I make the roof or topv of the oven chamber in a single piece or slab 30 which simply rests upon the top of the side Walls and may have more or To facilitate this sliding movement occasioned by. unequal expansion or contraction of the side walls, I may place a bearing plate 31 on the top of the side walls which formsa ybearing upon which the roof ,30 rests.I Where theovensare arranged in a battery.. as in the` illustration (Fig. 3), the roofs of the respective oven chambers are preferably made of such a width as t/o leave-an expanf sion space 32 between adjoining roofs so that there will be no interference'between such adjoining roofs.

The draft through the exit Hue or Hues may be governed by suitable means such as a sliding damper 33 located at the junction of the exit Hue with the exhaust passage. Additional 'means for controlling the draftl through .they exit Hue are preferably provided by making the grating 18 which forms the entrance to the exit Hue in removable sections, as indicated at 34 in Fig. l. An

increased draft may thus be obtained at any point in the length of the exit ii`ue by removing one or more of these'sections of the grating 18. Thus in the illustration Fig. l, the grating has been removed from over the rearward end of the exit flue and consequently the draft into the exit flue will be greatest at this rearward end of the oven chamber. The flow into the different portions in the length of the exit flue may be still further governed by providing means such as the removable cover plates for closing the openings in the grat-ing (see detail Fig. 4.-). The control of the flow of the waste products is of considerable assistance in obtaining the proper heatingoof the various portions of the oven chamber. For instance, when it is desired to heat a certain portion of the chamber the heat may be concentrated in lthatv portion of the chamber first by directing the heatingvmedium into that particular portion and secondly, by opening up the grating in the exit Hue at that portion of the chamber s as to create a stronger draft at that point. By using the cover plates 35 to entirely cutoff the iow into certain portions of the exit flue the heating of the oven chamber may be still further governed.

According to my invention the cores or other products to be baked or otherwise heat-treated are subjected to heat by radiation as well as by being directly contacted with the heating medium. Fig. 3 illustrates this point. ln this View is shown how the inlet or supply conduits l1 extend beneath' the Hoor or vhearth 36 of the oven chamber',

and how the passages 13 extend from these fines up through the .walls of the chamber. Consequently the. articles within the-chamber will be heated by radiation from the heated side walls and hearth. This is a de.

cided advantage because by utilizin both the heat of radiation and of con uction practically all the useful heat energy is al` sorbed within the oven chamber. Provision is preferably'made so that, if vdesired,gtheA heat may be dischargedf-directlyfinto the .oven chamber without being first "passedv through the side walls thereof. The'means for this purpose here consists in making the inlet filles with removable'cover 'plates-..37 which when removed will permit the heat ing mediumA to discharge from the inlet 'dues ll directly up into the oven chamber. By removing more or less of these cover plates in different portions of the oven chamber, a still further degree of control may be obtained. By the various means described l amthus enabled to heat the oven chamber either uniformly throughout or to heat certain portions of the same, and it will be further understood that'the portlons so A still further degree of control of the heat Within the oven chamber may be obtained by utilizing the dampers 38 with which the vapor discharge pipes 29 are preferably provided. It Will be seen that by opening these dampers a certain amount of the Waste products may be drawn ofr` from the upper portion of the. oven chamber out through the' discharge conduits. The regulation of these dempers therefore will serve, to a certain extent, to control the amount of heat in the upper portion of the oven chamber. While l have shown only a single exit flue located in the bottom of the oven chamber, l would have it understood that, if found necessary or desirable, more than one of such fines may be provided.

ln treating certain articles, and in particular when first starting up theffurnace, it is found that the imperfectly consumed products usuallygenerated when first starting u the furnace have a more or less injurious e feet on the cores or other articles. Particularly is this true when` burning coal as a fuel, for when first starting up such a fire considerable smoke and soot is usually given off. To prevent this injurious effect I may provide means such as illustra-ted in Figs. 5 dnd 6, in the form of a smoke Hue 39 located preferably as shown Within the upper portion of the wall "12 and in communication with the conduits l3'by extensions 40 at the ,upper ends of such conduits. The products from s uch smoke flue may be carried off through a pipe 41 which may, if desired, discharge into the main stack 28. A damper l2 is preferably provided for controlling discharge from this smoke flue. In the operation of this form of the apparatus the damper 42, or such other controlling means as may be employed, will preferably be left vopen at the time of lirst starting the furnace and consequent-ly the products of combustion instead of being discharged into the oven chamber will flow up into the smoke-flue and out the said Hue to the point of discharge. When the furnaace becomes` heated-to the lproper degree Sovthatproper combustion takes place,- theffheated products. may then be directed into the oven chamber by closing off the vdamper 42 thereby preventing further flow out through the smoke line.

'lo prevent loss of heat beneath the door ofthe oven chamber, there is preferably provided a sand seal indicated at. 43 in Fig. 2

to receive-the lower edge of the door, and escape of .heat at the top of the door may be prevented by mounting an angle iron 44.- on` the rearface of the door which -when the door isclosed engages with the top of/the oven chamber. v p 'While this invention relates particularly to core ovens., and.1s referred to as such throu hout the specification, I would have it un erstood that it is not limited to this one 'particular use, and the term core oven therefore is used merely as a convenient the walls of the oven chamber and terminating in outlets discharging into different portions of the oven chamber, and means for independently overning the discharge from the various out ets.

2. In an oven of the character-set forth, the combination of an oven chamber, a fur- -nace, supply conduits extending from thel furnace along beneath theside Walls of the loven chamber, branch conduits extending' from said supply conduits up through the ,side .walls of the oven chamber andprovided with outlets discharging into theoven chamber at different levels therein, independently adjustable closures controlling discharge through the said outlets, and means for withdrawing waste lproducts from the oven chamber.v

3. In-an oven of the character set forth, the combination of an oven chamberfa furnace', supply conduits extending from vthe furnace along substantially beneath the side walls of the oven chamber, branch conduits extending from saidv supply conduits up through the side walls of the oven chamber and provided with outlets discharging into the oven chamber at different levels therein,l independently adjustable closures controlling discharge through the said outlets, and an exit flue disposed in. thebottom of the oven chamber and in communication with lsaid chamber substantially the full length thereof.

4. In an oven of the character set forth,

-neath the side Wall of the oven chamber,

branch conduits extending from'saidlsupply conduit up through the side wall of the oven chamber and provided with discharge outlets opening into the oven chamber at different points therein, and an exit flue lol cated in the bottom of the oven chamber and if in communication with said chamber subinto said oven chambers at different points therein, exit iues in the bottoms of the oven chambers, and an exhaust passage at the back of the ovenchambers common to all the exit flues of thisJ different chambers.

6. In an apparatusof the character set forth, a heating `chamber provided with relatively -rigid side walls and. a roof supported by andA slidably restingv upon the side walls whereby unequal expansion or -con- 'i tractionof-the side walls will not affect the joint between the side walls and the roof, and means for introducing a heating medium into the heating chamber.

7 In an apparatus of the character set forth, a heating chamber, and means for introducing a heating medium into variablylocated predetermined ortions of the chainsv ber,'said heating` cham er having relatively rigid side walls anda roof supported by and slidably resting upon the side walls, whereby unequalexpansion or contraction of the side walls occasioned by 'unequal heating in the chamber will not affect the joint between the'sid'ev walls and the roof.

8. In an apparatus offthe character set forth, a plurality of heating chambers arranged side by side "and provided with relatively rigid sidewalls, roofs to the respective heating chambers supported -bjyJ and slidably resting upony the side walls ofthe respective chambers whereby expansion or contraction of such side walls will not affect the joint between the side walls androofs, the roofs of adjoining' heating chambers terminating lshort of contact with each other to leave an expansion space between adjoining roofs, and means for introducing a heating medium into the various chambers. l

9. In an oven`of the character set forth, thecombination with an o ven chamber, of heat-supplying conduits extending beneath the floor and up through the sidewalls of said oven chamber, and means for at will controlling discharge of the heated products into thel oven chamber from. the conduits beneath the Hoor of the oven chamber or from the conduits which extend up through the sides of the oven chamber.

l0. In an oven of the character set forth, the combination with an oven chamber, of :a supply conduit extending beneath lthe floor of the oven chamber, branch conduits extending from said Y supply conduit up- Hoor of the oven chamber and extending substantially the full length thereof, and a grating covering the said exit Hue and made in independently removable sections, and cover plates removably seated in said grating sections to prevent a discharge` theref through.

12. ln an oven of the character set forth,

. the combination with an oven chamber and means for discharging the heated products thereinto, of an exit flue disposed in the door of the` oven chamber and extending substantially the full length thereof, a gratmg covering said exit flue and provided with openings therein, and means for independently closing the openings in the grating.

chamber in communication with the passages aoresaid.

14. In an oven of the character set forth, the combination with an oven chamber, of supply conduits disposed at the base of the side walls of the chamber, smoke dues extending longitudinally of the side walls, in the upper portions thereof, passages extending up through the Walls between the supply conduits at the base thereof and the smoke ilues in the upper portion thereof, said passages provided with outlets into the oven chamber disposed at points intermediate the smoke lues at the top and the conduits' at the bottom, and means for controlling low through the said smoke ues.

Signed at New York city, in the county of New York and State of New York this 30th day of December A. D. 1912.

FRANK s. GARRETT.

Witnesses:

PHILIP S. MoLnAN, GEO. B. POOLE. 1 

